444 
PALAEONTOLOGY OF NEW YORK. 
cellus shale, above the limestone, in the finer shales of the Hamilton group, in 
■V 
Central New York, and in the coarser shales of the group in the neighborhood 
of Cazenovia. 
Formations and localities. In the Goniatite limestone, near Manlius and Scho¬ 
harie, and in the black shales above the limestone at the same places; also in 
the Hamilton group on the shores of Skaneateles lake, Owasco, Cayuga and 
Seneca lakes ; at Cazenovia and other places. 
C 
Goniatites uniangularis. 
PLATES LXXI, FIG. 14 ; LXXIV, FIG. 2. 
Goniatites uniangularis, Conrad. Journ. Acad. Nat. Sci. Phila., vol. 8, p. 268, pi. 16, fig. 4. 1842. 
“ “ “ Hall: Thirteenth Rep. N. Y. State Cah. Nat. Hist., p. 98, fig-. 6 (bis). 1860. 
“ “ “ “ Twenty-seventh Rep. N. Y. State Mus. Nat. Hist., p. 136. 1875. 
“ “ “ “ Illustrations of Devonian Fossils: Cephalopoda, pi. 71. 1876. 
Shell depressed, suborbieular, discoid, the transverse and lateral diameters of 
the original specimen being eight and twenty mm. respectively. Other 
specimens, referred to the same species, have similar proportions, a larger 
one being as eighteen to forty-six. The lateral faces are gently convex, a 
little more rapidly curving toward the outer margin, and the periphery is 
abruptly rounded. 
Volutions all embraced within the outer one, somewhat gradually increas¬ 
ing in the younger shells, and more rapidly expanding as the shell enlarges 
in growth. The number is probably about four, but no entire exposure has 
been observed. Umbilicus closed externally, and marked by a distinct, 
rounded depression. Transverse section semi-elliptical, a little expanding 
on each side at the base, which is deeply indented by the preceding volution. 
The enlargement of the volutions in a single turn of the spire, in the septate 
portion of an incomplete specimen, is as six to eleven and six to twelve, and 
in a larger individual as twelve to twenty-eight. In one specimen referred 
to this species the increase is as nine to fourteen ; and in another specimen, 
preserving a considerable portion of the chamber of habitation, the increase 
is about from ten to eighteen mm. 
